sys/netgraph7/iface/ng_iface.c

   1 /*
   2  * ng_iface.c
   3  */
   4
   5 /*-
   6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   7  * All rights reserved.
   8  *
   9  * Subject to the following obligations and disclaimer of warranty, use and
  10  * redistribution of this software, in source or object code forms, with or
  11  * without modifications are expressly permitted by Whistle Communications;
  12  * provided, however, that:
  13  * 1. Any and all reproductions of the source or object code must include the
  14  *    copyright notice above and the following disclaimer of warranties; and
  15  * 2. No rights are granted, in any manner or form, to use Whistle
  16  *    Communications, Inc. trademarks, including the mark "WHISTLE
  17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  18  *    such appears in the above copyright notice or in the software.
  19  *
  20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  36  * OF SUCH DAMAGE.
  37  *
  38  * Author: Archie Cobbs <archie@freebsd.org>
  39  *
  40  * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $
  41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  42  */
  43
  44 /*
  45  * This node is also a system networking interface. It has
  46  * a hook for each protocol (IP, AppleTalk, etc). Packets
  47  * are simply relayed between the interface and the hooks.
  48  *
  49  * Interfaces are named ng0, ng1, etc.  New nodes take the
  50  * first available interface name.
  51  *
  52  * This node also includes Berkeley packet filter support.
  53  */
  54
  55 #include "opt_inet.h"
  56 #include "opt_inet6.h"
  57
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <sys/errno.h>
  61 #include <sys/kernel.h>
  62 #include <sys/malloc.h>
  63 #include <sys/mbuf.h>
  64 #include <sys/random.h>
  65 #include <sys/sockio.h>
  66 #include <sys/socket.h>
  67 #include <sys/syslog.h>
  68 #include <sys/libkern.h>
  69
  70 #include <net/if.h>
  71 #include <net/if_types.h>
  72 #include <net/ifq_var.h>
  73 #include <net/bpf.h>
  74 #include <net/netisr.h>
  75
  76 #include <netinet/in.h>
  77
  78 #include <netgraph7/ng_message.h>
  79 #include <netgraph7/netgraph.h>
  80 #include <netgraph7/ng_parse.h>
  81 #include <netgraph7/cisco/ng_cisco.h>
  82 #include "ng_iface.h"
  83
  84 #ifdef NG_SEPARATE_MALLOC
  85 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
  86 #else
  87 #define M_NETGRAPH_IFACE M_NETGRAPH
  88 #endif
  89
  90 /* This struct describes one address family */
  91 struct iffam {
  92         sa_family_t     family;         /* Address family */
  93         const char      *hookname;      /* Name for hook */
  94 };
  95 typedef const struct iffam *iffam_p;
  96
  97 /* List of address families supported by our interface */
  98 static const struct iffam gFamilies[] = {
  99         { AF_INET,      NG_IFACE_HOOK_INET      },
 100         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 101         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 102         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 103 };
 104 #define NUM_FAMILIES            NELEM(gFamilies)
 105
 106 /* Node private data */
 107 struct ng_iface_private {
 108         struct  ifnet *ifp;             /* Our interface */
 109         int     unit;                   /* Interface unit number */
 110         node_p  node;                   /* Our netgraph node */
 111         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 112 };
 113 typedef struct ng_iface_private *priv_p;
 114
 115 /* Interface methods */
 116 static void     ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *);
 117 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
 118                         struct ucred *cr);
 119 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 120                         struct sockaddr *dst, struct rtentry *rt0);
 121 static void     ng_iface_bpftap(struct ifnet *ifp,
 122                         struct mbuf *m, sa_family_t family);
 123 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 124                         sa_family_t sa);
 125 #ifdef DEBUG
 126 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 127 #endif
 128
 129 /* Netgraph methods */
 130 static int              ng_iface_mod_event(module_t, int, void *);
 131 static ng_constructor_t ng_iface_constructor;
 132 static ng_rcvmsg_t      ng_iface_rcvmsg;
 133 static ng_shutdown_t    ng_iface_shutdown;
 134 static ng_newhook_t     ng_iface_newhook;
 135 static ng_rcvdata_t     ng_iface_rcvdata;
 136 static ng_disconnect_t  ng_iface_disconnect;
 137
 138 /* Helper stuff */
 139 static iffam_p  get_iffam_from_af(sa_family_t family);
 140 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 141 static iffam_p  get_iffam_from_name(const char *name);
 142 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 143
 144 /* Parse type for struct ng_cisco_ipaddr */
 145 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 146         = NG_CISCO_IPADDR_TYPE_INFO;
 147 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 148         &ng_parse_struct_type,
 149         &ng_cisco_ipaddr_type_fields
 150 };
 151
 152 /* List of commands and how to convert arguments to/from ASCII */
 153 static const struct ng_cmdlist ng_iface_cmds[] = {
 154         {
 155           NGM_IFACE_COOKIE,
 156           NGM_IFACE_GET_IFNAME,
 157           "getifname",
 158           NULL,
 159           &ng_parse_string_type
 160         },
 161         {
 162           NGM_IFACE_COOKIE,
 163           NGM_IFACE_POINT2POINT,
 164           "point2point",
 165           NULL,
 166           NULL
 167         },
 168         {
 169           NGM_IFACE_COOKIE,
 170           NGM_IFACE_BROADCAST,
 171           "broadcast",
 172           NULL,
 173           NULL
 174         },
 175         {
 176           NGM_CISCO_COOKIE,
 177           NGM_CISCO_GET_IPADDR,
 178           "getipaddr",
 179           NULL,
 180           &ng_cisco_ipaddr_type
 181         },
 182         {
 183           NGM_IFACE_COOKIE,
 184           NGM_IFACE_GET_IFINDEX,
 185           "getifindex",
 186           NULL,
 187           &ng_parse_uint32_type
 188         },
 189         { 0 }
 190 };
 191
 192 /* Node type descriptor */
 193 static struct ng_type typestruct = {
 194         .version =      NG_ABI_VERSION,
 195         .name =         NG_IFACE_NODE_TYPE,
 196         .mod_event =    ng_iface_mod_event,
 197         .constructor =  ng_iface_constructor,
 198         .rcvmsg =       ng_iface_rcvmsg,
 199         .shutdown =     ng_iface_shutdown,
 200         .newhook =      ng_iface_newhook,
 201         .rcvdata =      ng_iface_rcvdata,
 202         .disconnect =   ng_iface_disconnect,
 203         .cmdlist =      ng_iface_cmds,
 204 };
 205 NETGRAPH_INIT(iface, &typestruct);
 206
 207 /* We keep a bitmap indicating which unit numbers are free.
 208    One means the unit number is free, zero means it's taken. */
 209 static int      *ng_iface_units = NULL;
 210 static int      ng_iface_units_len = 0;
 211
 212 #define UNITS_BITSPERWORD       (sizeof(*ng_iface_units) * NBBY)
 213
 214
 215 /************************************************************************
 216                         HELPER STUFF
 217  ************************************************************************/
 218
 219 /*
 220  * Get the family descriptor from the family ID
 221  */
 222 static __inline iffam_p
 223 get_iffam_from_af(sa_family_t family)
 224 {
 225         iffam_p iffam;
 226         int k;
 227
 228         for (k = 0; k < NUM_FAMILIES; k++) {
 229                 iffam = &gFamilies[k];
 230                 if (iffam->family == family)
 231                         return (iffam);
 232         }
 233         return (NULL);
 234 }
 235
 236 /*
 237  * Get the family descriptor from the hook
 238  */
 239 static __inline iffam_p
 240 get_iffam_from_hook(priv_p priv, hook_p hook)
 241 {
 242         int k;
 243
 244         for (k = 0; k < NUM_FAMILIES; k++)
 245                 if (priv->hooks[k] == hook)
 246                         return (&gFamilies[k]);
 247         return (NULL);
 248 }
 249
 250 /*
 251  * Get the hook from the iffam descriptor
 252  */
 253
 254 static __inline hook_p *
 255 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 256 {
 257         return (&priv->hooks[iffam - gFamilies]);
 258 }
 259
 260 /*
 261  * Get the iffam descriptor from the name
 262  */
 263 static __inline iffam_p
 264 get_iffam_from_name(const char *name)
 265 {
 266         iffam_p iffam;
 267         int k;
 268
 269         for (k = 0; k < NUM_FAMILIES; k++) {
 270                 iffam = &gFamilies[k];
 271                 if (!strcmp(iffam->hookname, name))
 272                         return (iffam);
 273         }
 274         return (NULL);
 275 }
 276
 277 /*
 278  * Find the first free unit number for a new interface.
 279  * Increase the size of the unit bitmap as necessary.
 280  */
 281 static __inline__ int
 282 ng_iface_get_unit(int *unit)
 283 {
 284         int index, bit;
 285
 286         for (index = 0; index < ng_iface_units_len
 287             && ng_iface_units[index] == 0; index++);
 288         if (index == ng_iface_units_len) {              /* extend array */
 289                 int i, *newarray, newlen;
 290
 291                 newlen = (2 * ng_iface_units_len) + 4;
 292                 newarray = kmalloc(newlen * sizeof(*ng_iface_units),
 293                     M_NETGRAPH_IFACE, M_NOWAIT);
 294                 if (newarray == NULL)
 295                         return (ENOMEM);
 296                 bcopy(ng_iface_units, newarray,
 297                     ng_iface_units_len * sizeof(*ng_iface_units));
 298                 for (i = ng_iface_units_len; i < newlen; i++)
 299                         newarray[i] = ~0;
 300                 if (ng_iface_units != NULL)
 301                         kfree(ng_iface_units, M_NETGRAPH_IFACE);
 302                 ng_iface_units = newarray;
 303                 ng_iface_units_len = newlen;
 304         }
 305         bit = ffs(ng_iface_units[index]) - 1;
 306         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
 307             ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit));
 308         ng_iface_units[index] &= ~(1 << bit);
 309         *unit = (index * UNITS_BITSPERWORD) + bit;
 310         return (0);
 311 }
 312
 313 /*
 314  * Free a no longer needed unit number.
 315  */
 316 static __inline__ void
 317 ng_iface_free_unit(int unit)
 318 {
 319         int index, bit;
 320
 321         index = unit / UNITS_BITSPERWORD;
 322         bit = unit % UNITS_BITSPERWORD;
 323         KASSERT(index < ng_iface_units_len,
 324             ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len));
 325         KASSERT((ng_iface_units[index] & (1 << bit)) == 0,
 326             ("%s: unit=%d is free", __func__, unit));
 327         ng_iface_units[index] |= (1 << bit);
 328         /*
 329          * XXX We could think about reducing the size of ng_iface_units[]
 330          * XXX here if the last portion is all ones
 331          */
 332 }
 333
 334 /************************************************************************
 335                         INTERFACE STUFF
 336  ************************************************************************/
 337
 338 /*
 339  * Process an ioctl for the virtual interface
 340  */
 341 static int
 342 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data,
 343     struct ucred *cr)
 344 {
 345         struct ifreq *const ifr = (struct ifreq *) data;
 346         int error = 0;
 347
 348 #ifdef DEBUG
 349         ng_iface_print_ioctl(ifp, command, data);
 350 #endif
 351         crit_enter();
 352         switch (command) {
 353
 354         /* These two are mostly handled at a higher layer */
 355         case SIOCSIFADDR:
 356                 ifp->if_flags |= IFF_UP;
 357                 ifp->if_flags |= IFF_RUNNING;
 358                 ifq_clr_oactive(&ifp->if_snd);
 359                 break;
 360         case SIOCGIFADDR:
 361                 break;
 362
 363         /* Set flags */
 364         case SIOCSIFFLAGS:
 365                 /*
 366                  * If the interface is marked up and stopped, then start it.
 367                  * If it is marked down and running, then stop it.
 368                  */
 369                 if (ifr->ifr_flags & IFF_UP) {
 370                         if (!(ifp->if_flags & IFF_RUNNING)) {
 371                                 ifq_clr_oactive(&ifp->if_snd);
 372                                 ifp->if_flags |= IFF_RUNNING;
 373                         }
 374                 } else {
 375                         if (ifp->if_flags & IFF_RUNNING) {
 376                                 ifp->if_flags &= ~IFF_RUNNING;
 377                                 ifq_clr_oactive(&ifp->if_snd);
 378                         }
 379                 }
 380                 break;
 381
 382         /* Set the interface MTU */
 383         case SIOCSIFMTU:
 384                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 385                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 386                         error = EINVAL;
 387                 else
 388                         ifp->if_mtu = ifr->ifr_mtu;
 389                 break;
 390
 391         /* Stuff that's not supported */
 392         case SIOCADDMULTI:
 393         case SIOCDELMULTI:
 394                 error = 0;
 395                 break;
 396         case SIOCSIFPHYS:
 397                 error = EOPNOTSUPP;
 398                 break;
 399
 400         default:
 401                 error = EINVAL;
 402                 break;
 403         }
 404         crit_exit();
 405         return (error);
 406 }
 407
 408 /*
 409  * This routine is called to deliver a packet out the interface.
 410  * We simply look at the address family and relay the packet to
 411  * the corresponding hook, if it exists and is connected.
 412  */
 413
 414 static int
 415 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 416                 struct sockaddr *dst, struct rtentry *rt0)
 417 {
 418         uint32_t af;
 419         int error;
 420
 421         /* Check interface flags */
 422         if (!((ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING))) {
 423                 m_freem(m);
 424                 return (ENETDOWN);
 425         }
 426
 427         /* BPF writes need to be handled specially. */
 428         if (dst->sa_family == AF_UNSPEC) {
 429                 bcopy(dst->sa_data, &af, sizeof(af));
 430                 dst->sa_family = af;
 431         }
 432
 433         /* Berkeley packet filter */
 434         ng_iface_bpftap(ifp, m, dst->sa_family);
 435
 436         if (ifq_is_enabled(&ifp->if_snd)) {
 437                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 438                 if (m == NULL) {
 439                         IFNET_STAT_INC(ifp, oerrors, 1);
 440                         return (ENOBUFS);
 441                 }
 442                 *(sa_family_t *)m->m_data = dst->sa_family;
 443                 error = ifq_dispatch(ifp, m, NULL);
 444         } else
 445                 error = ng_iface_send(ifp, m, dst->sa_family);
 446
 447         return (error);
 448 }
 449
 450 /*
 451  * Start method is used only when ALTQ is enabled.
 452  */
 453 static void
 454 ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
 455 {
 456         sa_family_t sa;
 457
 458         KASSERT(ifq_is_enabled(&ifp->if_snd), ("%s without ALTQ", __func__));
 459
 460         for(;;) {
 461                 struct mbuf *m;
 462
 463                 m = ifq_dequeue(&ifp->if_snd);
 464                 if (m == NULL)
 465                         break;
 466                 sa = *mtod(m, sa_family_t *);
 467                 m_adj(m, sizeof(sa_family_t));
 468                 ng_iface_send(ifp, m, sa);
 469         }
 470 }
 471
 472 /*
 473  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 474  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 475  */
 476 static void
 477 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 478 {
 479         int32_t family4 = (int32_t)family;
 480
 481         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 482
 483         if (ifp->if_bpf) {
 484                 bpf_gettoken();
 485                 if (ifp->if_bpf)
 486                         bpf_ptap(ifp->if_bpf, m, &family4, sizeof(family4));
 487                 bpf_reltoken();
 488         }
 489 }
 490
 491 /*
 492  * This routine does actual delivery of the packet into the
 493  * netgraph(4). It is called from ng_iface_start() and
 494  * ng_iface_output().
 495  */
 496 static int
 497 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 498 {
 499         const priv_p priv = (priv_p) ifp->if_softc;
 500         const iffam_p iffam = get_iffam_from_af(sa);
 501         int error;
 502         int len;
 503
 504         /* Check address family to determine hook (if known) */
 505         if (iffam == NULL) {
 506                 m_freem(m);
 507                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 508                 return (EAFNOSUPPORT);
 509         }
 510
 511         /* Copy length before the mbuf gets invalidated. */
 512         len = m->m_pkthdr.len;
 513
 514         /* Send packet. If hook is not connected,
 515            mbuf will get freed. */
 516         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 517
 518         /* Update stats. */
 519         if (error == 0) {
 520                 IFNET_STAT_INC(ifp, obytes, len);
 521                 IFNET_STAT_INC(ifp, opackets, 1);
 522         }
 523
 524         return (error);
 525 }
 526
 527 #ifdef DEBUG
 528 /*
 529  * Display an ioctl to the virtual interface
 530  */
 531
 532 static void
 533 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 534 {
 535         char   *str;
 536
 537         switch (command & IOC_DIRMASK) {
 538         case IOC_VOID:
 539                 str = "IO";
 540                 break;
 541         case IOC_OUT:
 542                 str = "IOR";
 543                 break;
 544         case IOC_IN:
 545                 str = "IOW";
 546                 break;
 547         case IOC_INOUT:
 548                 str = "IORW";
 549                 break;
 550         default:
 551                 str = "IO??";
 552         }
 553         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 554                ifp->if_xname,
 555                str,
 556                IOCGROUP(command),
 557                command & 0xff,
 558                IOCPARM_LEN(command));
 559 }
 560 #endif /* DEBUG */
 561
 562 /************************************************************************
 563                         NETGRAPH NODE STUFF
 564  ************************************************************************/
 565
 566 /*
 567  * Constructor for a node
 568  */
 569 static int
 570 ng_iface_constructor(node_p node)
 571 {
 572         struct ifnet *ifp;
 573         priv_p priv;
 574         int error;
 575
 576         /* Allocate node and interface private structures */
 577         priv = kmalloc(sizeof(*priv), M_NETGRAPH_IFACE,
 578                        M_WAITOK | M_NULLOK | M_ZERO);
 579         if (priv == NULL)
 580                 return (ENOMEM);
 581         ifp = kmalloc(sizeof(*ifp), M_NETGRAPH_IFACE, M_WAITOK | M_NULLOK | M_ZERO);
 582         if (ifp == NULL) {
 583                 kfree(priv, M_NETGRAPH_IFACE);
 584                 return (ENOMEM);
 585         }
 586
 587         /* Link them together */
 588         ifp->if_softc = priv;
 589         priv->ifp = ifp;
 590
 591         /* Get an interface unit number */
 592         if ((error = ng_iface_get_unit(&priv->unit)) != 0) {
 593                 kfree(ifp, M_NETGRAPH_IFACE);
 594                 kfree(priv, M_NETGRAPH_IFACE);
 595                 return (error);
 596         }
 597
 598
 599         /* Link together node and private info */
 600         NG_NODE_SET_PRIVATE(node, priv);
 601         priv->node = node;
 602
 603         /* Initialize interface structure */
 604         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 605         ifp->if_output = ng_iface_output;
 606         ifp->if_start = ng_iface_start;
 607         ifp->if_ioctl = ng_iface_ioctl;
 608         ifp->if_watchdog = NULL;
 609         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 610         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 611         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 612         ifp->if_addrlen = 0;                    /* XXX */
 613         ifp->if_hdrlen = 0;                     /* XXX */
 614         ifp->if_baudrate = 64000;               /* XXX */
 615         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 616         ifq_set_ready(&ifp->if_snd);
 617
 618         /* Give this node the same name as the interface (if possible) */
 619         if (ng_name_node(node, ifp->if_xname) != 0)
 620                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 621                     ifp->if_xname);
 622
 623         /* Attach the interface */
 624         if_attach(ifp, NULL);
 625         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 626
 627         /* Done */
 628         return (0);
 629 }
 630
 631 /*
 632  * Give our ok for a hook to be added
 633  */
 634 static int
 635 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 636 {
 637         const iffam_p iffam = get_iffam_from_name(name);
 638         hook_p *hookptr;
 639
 640         if (iffam == NULL)
 641                 return (EPFNOSUPPORT);
 642         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 643         if (*hookptr != NULL)
 644                 return (EISCONN);
 645         *hookptr = hook;
 646         NG_HOOK_HI_STACK(hook);
 647         return (0);
 648 }
 649
 650 /*
 651  * Receive a control message
 652  */
 653 static int
 654 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 655 {
 656         const priv_p priv = NG_NODE_PRIVATE(node);
 657         struct ifnet *const ifp = priv->ifp;
 658         struct ng_mesg *resp = NULL;
 659         int error = 0;
 660         struct ng_mesg *msg;
 661
 662         NGI_GET_MSG(item, msg);
 663         switch (msg->header.typecookie) {
 664         case NGM_IFACE_COOKIE:
 665                 switch (msg->header.cmd) {
 666                 case NGM_IFACE_GET_IFNAME:
 667                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
 668                         if (resp == NULL) {
 669                                 error = ENOMEM;
 670                                 break;
 671                         }
 672                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 673                         break;
 674
 675                 case NGM_IFACE_POINT2POINT:
 676                 case NGM_IFACE_BROADCAST:
 677                     {
 678
 679                         /* Deny request if interface is UP */
 680                         if ((ifp->if_flags & IFF_UP) != 0)
 681                                 return (EBUSY);
 682
 683                         /* Change flags */
 684                         switch (msg->header.cmd) {
 685                         case NGM_IFACE_POINT2POINT:
 686                                 ifp->if_flags |= IFF_POINTOPOINT;
 687                                 ifp->if_flags &= ~IFF_BROADCAST;
 688                                 break;
 689                         case NGM_IFACE_BROADCAST:
 690                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 691                                 ifp->if_flags |= IFF_BROADCAST;
 692                                 break;
 693                         }
 694                         break;
 695                     }
 696
 697                 case NGM_IFACE_GET_IFINDEX:
 698                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK);
 699                         if (resp == NULL) {
 700                                 error = ENOMEM;
 701                                 break;
 702                         }
 703                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 704                         break;
 705
 706                 default:
 707                         error = EINVAL;
 708                         break;
 709                 }
 710                 break;
 711         case NGM_CISCO_COOKIE:
 712                 switch (msg->header.cmd) {
 713                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 714                     {
 715                         struct ifaddr_container *ifac;
 716
 717                         /* Return the first configured IP address */
 718                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 719                                 struct ifaddr *ifa = ifac->ifa;
 720                                 struct ng_cisco_ipaddr *ips;
 721
 722                                 if (ifa->ifa_addr->sa_family != AF_INET)
 723                                         continue;
 724                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK);
 725                                 if (resp == NULL) {
 726                                         error = ENOMEM;
 727                                         break;
 728                                 }
 729                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 730                                 ips->ipaddr = ((struct sockaddr_in *)
 731                                                 ifa->ifa_addr)->sin_addr;
 732                                 ips->netmask = ((struct sockaddr_in *)
 733                                                 ifa->ifa_netmask)->sin_addr;
 734                                 break;
 735                         }
 736
 737                         /* No IP addresses on this interface? */
 738                         if (ifac == NULL)
 739                                 error = EADDRNOTAVAIL;
 740                         break;
 741                     }
 742                 default:
 743                         error = EINVAL;
 744                         break;
 745                 }
 746                 break;
 747         case NGM_FLOW_COOKIE:
 748                 switch (msg->header.cmd) {
 749                 case NGM_LINK_IS_UP:
 750                         ifp->if_flags |= IFF_RUNNING;
 751                         break;
 752                 case NGM_LINK_IS_DOWN:
 753                         ifp->if_flags &= ~IFF_RUNNING;
 754                         break;
 755                 default:
 756                         break;
 757                 }
 758                 break;
 759         default:
 760                 error = EINVAL;
 761                 break;
 762         }
 763         NG_RESPOND_MSG(error, node, item, resp);
 764         NG_FREE_MSG(msg);
 765         return (error);
 766 }
 767
 768 /*
 769  * Recive data from a hook. Pass the packet to the correct input routine.
 770  */
 771 static int
 772 ng_iface_rcvdata(hook_p hook, item_p item)
 773 {
 774         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 775         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 776         struct ifnet *const ifp = priv->ifp;
 777         struct mbuf *m;
 778         int isr;
 779
 780         NGI_GET_M(item, m);
 781         NG_FREE_ITEM(item);
 782         /* Sanity checks */
 783         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 784         M_ASSERTPKTHDR(m);
 785         if ((ifp->if_flags & IFF_UP) == 0) {
 786                 NG_FREE_M(m);
 787                 return (ENETDOWN);
 788         }
 789
 790         /* Update interface stats */
 791         IFNET_STAT_INC(ifp, ipackets, 1);
 792         IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);
 793
 794         /* Note receiving interface */
 795         m->m_pkthdr.rcvif = ifp;
 796
 797         /* Berkeley packet filter */
 798         ng_iface_bpftap(ifp, m, iffam->family);
 799
 800         /* Send packet */
 801         switch (iffam->family) {
 802 #ifdef INET
 803         case AF_INET:
 804                 isr = NETISR_IP;
 805                 break;
 806 #endif
 807 #ifdef INET6
 808         case AF_INET6:
 809                 isr = NETISR_IPV6;
 810                 break;
 811 #endif
 812         default:
 813                 m_freem(m);
 814                 return (EAFNOSUPPORT);
 815         }
 816 #if 0
 817         /* First chunk of an mbuf contains good junk */
 818         if (harvest.point_to_point)
 819                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 820 #endif
 821         netisr_queue(isr, m);
 822         return (0);
 823 }
 824
 825 /*
 826  * Shutdown and remove the node and its associated interface.
 827  */
 828 static int
 829 ng_iface_shutdown(node_p node)
 830 {
 831         const priv_p priv = NG_NODE_PRIVATE(node);
 832
 833         bpfdetach(priv->ifp);
 834         if_detach(priv->ifp);
 835         kfree(priv->ifp, M_NETGRAPH_IFACE);
 836         priv->ifp = NULL;
 837         ng_iface_free_unit(priv->unit);
 838         kfree(priv, M_NETGRAPH_IFACE);
 839         NG_NODE_SET_PRIVATE(node, NULL);
 840         NG_NODE_UNREF(node);
 841         return (0);
 842 }
 843
 844 /*
 845  * Hook disconnection. Note that we do *not* shutdown when all
 846  * hooks have been disconnected.
 847  */
 848 static int
 849 ng_iface_disconnect(hook_p hook)
 850 {
 851         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 852         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 853
 854         if (iffam == NULL)
 855                 panic(__func__);
 856         *get_hook_from_iffam(priv, iffam) = NULL;
 857         return (0);
 858 }
 859
 860 /*
 861  * Handle loading and unloading for this node type.
 862  */
 863 static int
 864 ng_iface_mod_event(module_t mod, int event, void *data)
 865 {
 866         int error = 0;
 867
 868         switch (event) {
 869         case MOD_LOAD:
 870                 break;
 871         case MOD_UNLOAD:
 872                 break;
 873         default:
 874                 error = EOPNOTSUPP;
 875                 break;
 876         }
 877         return (error);
 878 }